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A volcano erupting can have a cooling effect. By putting a lot of dust in the upper atmosphere and reflecting sunlight. This happened fairly recently. Krakatoa blew up in the 1880s and some of the coldest winters on record are 1888-89. A lot of those records still stand today. There are many variables involved with the climate on our planet.

A volcanic eruption can have only a very slight, imperceptible effect on the level of atmospheric carbon dioxide and consequently on global warming. For example, the volcano that erupted in Iceland in 2010 vented between 150,000 and 300,000 tonnes of carbon dioxide per day. This is minuscule compared to emissions from burning fossil fuels, of around 30 billion tonnes per year.

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